[tutor]

Hi,

As far as I understand, the pisoFoam solver restricts users to maximum Courant number of approximately one, whereas pimpleFoam can get around this restriction with the use of multiple outerCorrectors.

One of the MAJOR reasons why an implicit solver is preferred over an explicit one (which is much faster and easy to code) is to avoid the maximum Courant number restriction.

pisoFoam, using an implicit formulation still has the restriction.

So, why would someone use pisoFoam ever? Can't we get the same stuff done at a fraction of computational time using an explicit solver?